Blood-pressure recorder



C. E. .DF-BESSLER BLOOD Phssuam RECORDER Jan. 15, 1924- Filed DOO. 24. 1921 555% 1w @Home/1j Jan. 15, 1924.

C. E. DRESSLER BLOOD PRESSURE RECORDER Filed DGC- 1921 2 Sheets-Sheet 2 Patented Jan. 15, 1924.

UNlTED STATES CHARLES E. DRESSLER, F NEW YORK, N. Y.

BLOOD-PRESSURE RECORDER.

Application led December 24, 1921.

To all whom it 'may concern.:

Be it known that I, CHARLES E. Dnnssnnn, a citizen of the United States, and resident of New Yiirk city, in the county of New York and State of New York, have invented certain new and useful Improvements in Blood-Pressure Recorders, of which the following is a specification.

This invention relates to blood pressure recording instruments. The object of the invention is to provide a small compact. easily operated, portable apparatus containing a simply constructed, yet accurate and eii'ective mechanism for graphically recording the blood pressure of a patient for the physicians use.

Accordingly my invention is embodied in a blood pressure recorder constructed and .arranged as hereinafter set forth and as iilustrated in the accompanying drawings wach-- Figure 1 is a view of a strip of paper showfng a record obtained by the use of the biood pressure recorder.

Figure 2 is a front view of the apparatus set up ready for use with parts omitted,

Figure 3 is a plan view of the apparan tus shown in Figure 2 with parts broken away.

Figure 4 is a side view of the main portions of the apparatus looking towards the left in Figure 2.

Figure 5 is a small outline view of the y entire apparatus.

Referring to Figures 2 t0 5 the apparatus is contained within a suitable wooden case 6 provided with a hinged cover 7 The casing is large enough to contain all the parts required to obtain a record, and so balanced that when the apparatus is in use, the casing may stand with its cover open as in Figure 5.

rThe forward end of the casing G-to the left in Figure 3-is covered with a metal plate 8 forming a base provided with openings for receiving thepegs or'feet 9, 9 of an upright support 10. To the latter is adjustablyI secured a bracket 11, which has two pins 12, 12 slidably carried in bosses 13, 13 on the upright 10 for the purpose of lateral alinement between the two members and 11. Adjustment is effected by turning the k'nurled nut 14 whereby the stem 15 in the bracket 11 is moved towards or away from the upright 10 as will be under- Serial No. 524.567.

stood. A spring 16 provides the required tension between the nut 14 and the stem 15.

The bracket 11 carries a diaphragm casing 17 secured to a recorder casing 18. The diaphragm casing contains a suitable diaphragm 19 provided with a button 20 which acts against a lever 21 pivoted Within the casing 18 at 22.

The lever 21 rests by gravity against a pen arm 23 pivoted at 24. The arm projects downwardly through the casing outside of which it carries a recording pen 25. Inside the casing the arm 23 carries an indicating pointer 26 adapted to move over and indicate on a scale 27 of blood pressure from zero to 300 m. in. Hg.

The recorder casing 18 has an open front covered with a glass 28. The arrangement with respect to the lever 21 and pen arm 23 is for purposes of compounding the diaphragm movements as is obvious7 vand in order to reduce disturbing friction between the two elements, wire loops 29 and 39 form the points of contact between them as shown.

It follows from the foregoing thatl operation of the nut 14 causes lateral adjustment of the pen 25.

The recording pen has a reservoir for ink and is adapted to trace ay record on the paper 32 from the paper supply roll 33 suitably mounted to rotateJ in the casing as for instance by providing the latter with a cut out portion 34 and a bearing 35. The paper roll is journaled in said cut outJ 34 and in he bearing.

The paper passes from the roll 33 between a feed roller 36 and a printing roller 37 and forwardly over a convenient loosely secured bracket 38. The feed roller is operated by a handle 39, see Figure 5, through suitable gearing 40, Figure 4. The printing roller is journaled in brackets 41, 41 and forwardly of said printing roller a tension roller 42 may be provided. A spring 43 on each side secured to the brackets 41 keeps the roller 42 under proper tension.

The printing roller is graduated to print a scale calibrated in comparison with a standard scale of blood pressure from zero to 300 m. m. Hg. which is printed on the paper as it unrolls from the paper roll.

Ink is supplied to the printing roller from an ink pad 64 carried by a rod 44, see Figure 3, which in turn is adjustably mounted by mit M 21 csrrii by im firm i8 jj sf by' ri, screw 50. Tension @ii rmi fifi; by spri 5i ad i'iis'csid barrisd by miie arm 48. ihs posi .W Limi the spring may bs adjustsd by screw us L buf screw M.

lbe iapbrsgm @rising 17 communicates Wib 'bbs usual aririiet Ur cuff 55 by a rubber bbs@ 56 proyiisd wih :in air yaiive 5?, sse Figure Tb@ armist is inisted by an iiiiiaimr f Tb@ ifsregoing describes tbe apparatus it- Wiii bs :noted -bzi ii; is very comii @bis ro adjust the pen accurately sieur' acrsss 11b@ papier, sind ibs proper bensioii on the iiiii pad, for Clean iiiiriiigi; @rp the priming roller is also easily @-btsiiiid. The sevsrzii adjusments ami greniiispscion of *die apparatus may iii be Gris ab be from. ifhen not in use ibs uprigbi i0 is iiiisci up away from bha piae 8 simi said uprigbb with pari-s carried thereby may iban be iziid ini@ he czisingj sggstber Wit "bs @must und rubber bose mici bhs @isses @mi csrrisri about.. @ming @psr-i i the piiysicL. burns 'the Crank 39 wiiii i i righi: iiziiiri, er l or orbsr riwbr mi@ be used for ibis yiiirposfe9 anni with bis ie" ":.\T 'i basis ibs puise @if h@ pisi 'i marie ibs pamper iiiroiis irmi'; or physician 3mi/stads ii iii s@ @im it may be easiiy read and diagmssffi,

l'vvof tbs blood prsssur@ rees The; armi@ 0r auf? .bm

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Th@ record; thus made is @but 0i' miic or high pressure and is marked 9() iii Figure 1. Finally wbsri siii tbs has passed out of the armlet, the pen traces the record as af@ 100 showing the diastolic or 10W pressur@ record imm Whisk ibs pen basses to ser@ in this manner bb@ physician bas obaiiisci a graphic record of the pa'isnis puise 'ller using1 and at die same time observe i nioveinenbs of the arrGW 26 overihe scaJ s i The speed ai; which *dis paper is ruil perds upon ih@ cass and. is Within rb@ cmi trol @if 'bhe physician.,

Tile cai@ prirrieci by @he printing riiiisr is rspsasci im saab roaiimi s@l "1y readabi and a'vaiiabi@ sii die sam rsiisr printing of cmirse bri-iii rb marais is web, as ibcgrziiiscioii iines. Qpsrsioii may rspsaisd thus ibs f 0rd dieci/zeri.

The foregoing is thought i@ bissig; iiorb tbs @Cuisinier-imi, berzrisii U i acimii'tapgss si' "ibis zippziraiis. is

s brsacily iiew iii ia'a iisi'sf existed for rsmrci Gi' 'ibs ci ib@ iiiysirtimi i combiimioii blood prsssurs @aiming passais istrip of bips@ s, psig rr 5, :1 m abs sind peri or i Ci' `=1 .G ,wf sami @0X Lor piiiiiiii sure seais `on said im :r m

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